Mathematical and Physical Journal
for High Schools
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Problem P. 4265. (September 2010)

P. 4265. A 200 m-long car convoy is travelling at a speed of 10 m/s. From the end of the convoy a motorbike starts to move to the front of the convoy at a speed of 20 m/s.

a) How long does it take to reach the front of the convoy?

b) How long does it take to go back?

(3 pont)

Deadline expired on October 11, 2010.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. 20 s alatt ér előre, 6,7 s alatt vissza.


396 students sent a solution.
3 points:303 students.
2 points:72 students.
1 point:9 students.
0 point:5 students.
Unfair, not evaluated:7 solutionss.

Problems in Physics of KöMaL, September 2010